Launch Saviour

It’s software that automates the comparison of outputs between a legacy payroll system and a new one during implementation. Instead of manually exporting data and matching it in spreadsheets, the platform does the comparison for you, identifies variances and produces structured reporting. It’s faster, more consistent and produces the audit trail you need for a proper sign-off.

Manual parallel testing means exporting data from two systems and comparing it by hand, usually across multiple spreadsheets. It takes a long time, variances are easy to miss and working out why something doesn’t match is harder than it needs to be. Launch Saviour automates the comparison, surfaces variances immediately and produces structured reports — making parallel testing three times faster and significantly more reliable.

Launch Saviour is system agnostic, so it works regardless of which legacy system you’re moving from or which new platform you’re moving to. It’s the only parallel testing software on the market built specifically for payroll, designed to work across the major HR and payroll platforms. Talk to us about your setup and we’ll confirm compatibility.

Launch Saviour compares payroll outputs across all calculated elements — gross pay, deductions, net pay, statutory calculations, pension contributions and employer costs. Variances are automatically categorised so you can quickly see which differences are expected, which are explainable and which ones actually need looking into, without having to sort through everything manually.

Each parallel run produces a structured variance report showing what was tested, what variances were found, how they were categorised and how they were resolved. It gives programme leads, finance directors and other stakeholders a clear, auditable view of testing outcomes — so the go-live decision is backed by evidence, not just a feeling that it’s probably fine.

Setup is designed to be fast. Launch Saviour is built for implementation timelines, so getting connected and running your first comparison doesn’t require a long onboarding process. We’ll guide you through it and make sure you’re up and running quickly.

Yes, and it works well that way. Launch Saviour sits alongside the implementation programme and complements whatever testing the partner already has in place. It’s particularly useful where the partner’s parallel testing is manual or limited, giving your team independent visibility of variances without having to rely entirely on their outputs.

Launch Saviour is the software platform — automated parallel testing, variance detection and structured reporting. Assurance Saviour is the service that wraps around it, providing specialist payroll testing expertise and independent QA for teams who want expert support alongside the tool. The two are designed to work together, but can also be used on their own.

Primarily, yes — it’s built for the implementation and go-live window where parallel testing is most critical. For ongoing post-go-live change validation, system upgrades and configuration changes, Change Saviour is the managed testing service designed for that stage.

Payroll managers, HR transformation leads and implementation programme teams going through a payroll system migration who need a faster, more reliable way to run parallel testing. If you’ve ever spent weeks on a manual parallel run and thought there has to be a better way — there is. This is it.